diff --git a/src/Coder.php b/src/Coder.php
index 0e21b97..a161570 100644
--- a/src/Coder.php
+++ b/src/Coder.php
@@ -4,11 +4,16 @@
 
 namespace PetrKnap\Binary;
 
+use Stringable;
+
 /**
  * @internal shared logic
  */
-abstract class Coder
+abstract class Coder implements Stringable
 {
+    /**
+     * @param string $data may contain binary data
+     */
     final public function __construct(
         public readonly string $data = '',
     ) {
@@ -20,7 +25,7 @@ final public function withData(string $data): static
     }
 
     /**
-     * @deprecated use readonly property $data
+     * @deprecated use readonly property {@see self::$data}
      */
     final public function getData(): string
     {
@@ -61,4 +66,12 @@ abstract public function xz(): static;
      * @throws Coder\Exception\CoderException
      */
     abstract public function zlib(): static;
+
+    /**
+     * @note this is just a helper, this class is not supposed to implement {@see BinariableInterface}
+     */
+    public function __toString(): string
+    {
+        return $this->data;
+    }
 }